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Apache CVE-2026-34478

| EUVD-2026-21408 MEDIUM
Incorrect Provision of Specified Functionality (CWE-684)
2026-04-10 apache GHSA-445c-vh5m-36rj
Apache Code Injection
6.9
CVSS 4.0
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CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
EUVD ID Assigned
Apr 10, 2026 - 16:00 euvd
EUVD-2026-21408
Analysis Generated
Apr 10, 2026 - 16:00 vuln.today
Patch released
Apr 10, 2026 - 16:00 nvd
Patch available
CVE Published
Apr 10, 2026 - 15:40 nvd
MEDIUM 6.9

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 238 maven packages depend on org.apache.logging.log4j:log4j-core (107 direct, 131 indirect)

Ecosystem-wide dependent count for version 2.21.0.

DescriptionNVD

Apache Log4j Core's Rfc5424Layout https://logging.apache.org/log4j/2.x/manual/layouts.html#RFC5424Layout , in versions 2.21.0 through 2.25.3, is vulnerable to log injection via CRLF sequences due to undocumented renames of security-relevant configuration attributes.

Two distinct issues affect users of stream-based syslog services who configure Rfc5424Layout directly:

  • The newLineEscape attribute was silently renamed, causing newline escaping to stop working for users of TCP framing (RFC 6587), exposing them to CRLF injection in log output.
  • The useTlsMessageFormat attribute was silently renamed, causing users of TLS framing (RFC 5425) to be silently downgraded to unframed TCP (RFC 6587), without newline escaping.

Users of the SyslogAppender are not affected, as its configuration attributes were not modified.

Users are advised to upgrade to Apache Log4j Core 2.25.4, which corrects this issue.

AnalysisAI

Apache Log4j Core 2.21.0 through 2.25.3 allows remote log injection via CRLF sequences in Rfc5424Layout due to undocumented renaming of security-relevant configuration attributes (newLineEscape and useTlsMessageFormat). Attackers can inject malicious log entries or downgrade TLS-framed syslog to unframed TCP, compromising log integrity for stream-based syslog services. …

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CVE-2026-34478 vulnerability details – vuln.today
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